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If you think this has to do with the battery power, you also should check the contacts in the battery compartment. If the are not shiny, you can try to clean them with a dry cloth or a cotton swap. Don't use sharp tools in or close by a camera.
Make sure the battery is inserted correct and the battery cover should be locked correct.
If the camera was not used for a long time, perhaps some contacts are oxidised. Those contacts you can switch, try to switch them several times. Open and close the battery door several times. Press the on of button several times. Put the battery in and remove it several times. And hope the contacts will work again.
Try puffing some powder graphite into the key slot and inserting and removing the key several times. The tumbler pins get dry and jam in the holes and will not move so the graphite is the recommended lubricant for locks. Be careful as it leaves black residue that has to be cleaned with a wet clean rag.
Once the liquid was spilled it was important to open and do a full clean up on the board. Now it seems there is moisture or shorting in the board due to this which can cause this malfunction.
So it is best to remove the keypad and check on the mother board. Clean the board and dry using a hair dryer. Make sure that the keyboard also is fully dry .
Reset only after the board is fully found to be dry . If the set wont power ON then some damge was done when it was powered the last time due to the spillover shorting.
You could try resetting the computer.The car maybe in lockout mode.Try turning your car over….leave the ignition on.Wait exactly 10 min. Then try turning over again….again leave the key on. Wait exactly 10 min and do it a third time….this time the car should start…maybe run a lil rough while it relearns the processes of your vehicle again.It is important to wait the exact 10 min each time.You will probably need a battery charger or a set of jumper cables because if your car goes low during this process it will not work.Good luck and I hope this works.
The problem is
1- some dirt somehow got on the outside of the lense. After it was retracted fully in, it prevents the camera from opening again. When you turn it on, if it opens a little bit, try to pull it out NOT too hard and let go a few times. If it opened, clear the outside of the lense. Your camera should be back to normal.
2- If you droped the camera, you probably damaged or dislocated a mechanical part of the lense. You may have to take out the lense by unscrewing it and inspect it for damged parts or disconnected cable. Make sure clean the lense and test it by moving it in and out a few times, before puting it back on the camera.